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What kind of halogen is astatine?

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Astatine (At), formerly known as alabamine, is a radioactive element also classed as a halogen; its most stable isotope (which does not occur in nature) has a half-life of less than 8 1/2 hr. The chemical and physical properties of astatine are not well known; it is believed to resemble iodine.

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Similar questions: What is different about astatine? How is astatine different from the other halogens? What are the characteristic properties of astatine? [ Hide these questions ]

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